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Phyto-Synthesis, Characterization, and In Vitro Antibacterial Activity of Silver Nanoparticles Using Various Plant

Bilal Ahmad1,2, Li Chang1,3, Usama Qamar Satti4

  • 1College of Biology, Hunan University, Changsha 410082, China.

Bioengineering (Basel, Switzerland)
|December 23, 2022
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Summary

Green synthesis of silver nanoparticles (Ag-NPs) using plant extracts like Aloe vera and mint shows significant antibacterial activity against E. coli and S. aureus. These Ag-NPs also promote mung bean seedling growth, indicating potential as antimicrobial agents.

Keywords:
Ag-NPsAloe veraanti-bacterialgreen synthesisphytotoxicity

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Area of Science:

  • Green Chemistry and Nanotechnology
  • Plant Science and Microbiology

Background:

  • Silver nanoparticles (Ag-NPs) are increasingly explored for their antimicrobial properties.
  • Biosynthesis offers an eco-friendly alternative to conventional nanoparticle synthesis methods.

Purpose of the Study:

  • To synthesize stable silver nanoparticles (Ag-NPs) using leaf extracts of Aloe vera, Mentha arvensis (mint), Coriandrum sativum (coriander), and Cymbopogon citratus (lemongrass) via green chemistry.
  • To characterize the biosynthesized Ag-NPs and evaluate their efficacy in promoting plant growth and their antibacterial activity.

Main Methods:

  • Green synthesis of Ag-NPs using plant leaf extracts.
  • Characterization using UV-vis spectrophotometry, XRD, TGA, SEM, and EDX.
  • Assessment of plant growth promotion in mung bean seedlings.
  • Evaluation of antibacterial activity against Escherichia coli and Staphylococcus aureus using disc diffusion, MIC, and MBC tests.

Main Results:

  • Stable Ag-NPs with a particle size distribution of 10-22 nm were successfully synthesized.
  • Ag-NP treatment at 50 ppm significantly enhanced mung bean seedling growth.
  • Ag-NPs demonstrated notable antibacterial activity against E. coli and S. aureus, with MIC and MBC values ranging from 7 to 8 µg/mL.

Conclusions:

  • Plant-mediated synthesis is an effective method for producing stable Ag-NPs.
  • Biosynthesized Ag-NPs show potential as growth promoters for plants.
  • The synthesized Ag-NPs exhibit significant antimicrobial properties, suggesting their development as novel antibacterial agents.